Fountain-pen.



.13. RIESENBBRG.

FOUNTAIN PEN.

APPLIGATION FILED JULY 12, 1910,

Patented J an. 14, 1913.

f- E UNITED sTATEs PATENT oEEicE.

FELIX RIESENBEEG, or NEW YORK, 1v. Y.

d To all whom t may concern FOUNTAIN -PE1\T.

Be it known that I, FELIX RIESENBERG, a citizen of the United States,residing in the borough of Manhattan, city, county, and State of NewYork, have invented certain new and useful Improvements in Fo-untain-Pens, ofv which the following is a full and clear specification,illustrated by the accompanying drawings, the novelty of the inventionbeing. more fully pointed out in the annexed claims.

, In the United States Letters Patent granted .to me Aprilffl9th, 1910,numbered 955,205,

I have described means for ascertaining the'l height of an opaque fluidin the reservoir of a fountain pen, the same comprising in brieflenseslongitudinally arranged in the wall of the font and arranged to focuslight upon a. wall or surface of contrasting color within the font.

The present invention relates .to an improvement in this device withregard to the construction and arrangement of the contrasting walls orsurfaces within the font, and consists in a fountain pen font having alens or lenses substantially as shown and described in my said LettersPatent and having opposite each sightopening a surface of colorcontrasting with that of the writing fluid contained, consisting of ashort preferably flat or substantially plane plate arranged diamet-ricalof the font or substantially so and parallel to the lens or normal tothe axis `of the sight opening and preferably held in p-lace merely byfriction against the inner wall of the font.

In the accompanying drawingsFigure l is an elevationA of a fountain penembodying my invention. Fig. 2 is an axial sectional elevation taken ina plane at right angles with that of Fig. l. Fig. 3 is an axial sec- Itional elevation in a plane at right angles to Fig. 2,and Fig. 4 is atransverse sectional view through the font in a plane diametric of oneof the lenses.

As stated in my Letters Patent for the purpose of ascertaining theamount of fluid contained in the font 1 of the pen, I employ a pluralityof lenses 2, Figs. l and 2, whichv are arranged on the font in a row atsuitable intervals as shown in Fig. l. While these lenses may consist ofany suitable material, I- prefer a clear annealed glass with which Ihave obtained, the best results. These lenses are preferably round andare preferably provided with a shoulder 3 near the Specification ofLetters Patent. Patented Jan, 14, 1913. Application filed July 12,19,10. Serial No. 571`,564. v

the lenses is preferably 'so that their outer face will conform with theouter surface of the font so that no crevices or grooves are produced atthe joint between the glass and the font, in which dirt can collect. Forthis reason I have formed these lenses at their outer face cylindrical,that is to say, at all points parallel in the vertical direction withthe axis of the font, while in the direction transverse to the font, thelenses are convex and conform with the cylinder formed by the font. Theinner face of each lens is plane or very-slightly convex or concave. Itis obvious, however, that any other lens combination which is adapted toproperly enlarge the image of the contrasting surface and focus lightthereupon, is suitable for this purpose.-

Immediately opposite each lens, the plate 4 is arranged. These platesare made of suitable material. I prefer an opalescent glass of colorcontrasting with the particular ink used in the font, as for example,white where a dark ink is used. In some cases red or other color may bepreferred. These plates t are made of size to be slipped' snugly intothe greatest diameter of the font and be there held by friction againstthe walls of the font, and at right angles to a plane normal to itscorresponding lens.

I have found in practice that the ink quickly runs off of the small'surfaces of these plates and they are therefore quickly cleared of the.opaque ink which would otherwise render them less etlicient. A curvedsurface of considerable length would clear itself of ink so slowly as tobe o f little use. Being closer to the lenses which are focused uponthem', the plates are more easily observed. They occupy very littlespace in the pen font and therefore do not materially decrease itscapacity. They are easily installed and having flat surfaces, the lightis more easily focused upon them. Once in place, they are firmly held bythe friction of their side edges against the walls of the font and arenot liable to dislodgment or cracking oft.

lllhat l claim is:

l. ln a fountain pen, an ink font of opaque material having a sightopening in its side Wall, and Within it a longitudinal, substantiallydiametri@ and substantially plane plate ot Color Contrasting With thatoit the ink to be Contained in the pen and opposite and substantiallynormal to the axis ot the sight opening.

2. ln a fountain pen, an inli font oli opaque material having a sightopening in its side Wall, and Within it a longitudinal, substantia-llydiametric and substantially plane plate held by friction ot it-s edgesagainst the Walls of the font, ot color Contrasting With that of theinli to be contained in the pen and opposite and substantially normal tothe axis of the sight opening.

3. ln a fountain pen, an ink font of opaque material having alongitudinal series oi sight openings arranged in its side Wall,

Losanna and Within it a series ot longitudinal substantially diametri@and substantially plane plates slightly exceeding in length the Widthol' the sight openings, of color contrasting with that ofthe ink to becontained in the pen and opposite and substantially normal to the axes'of the sight openings.

il. ln a fountain pen, an ink font ot opaque material having alongitudinal series ot sight openings arranged in its side Wall, andWithin it a series of longitudinal substantially diametri@ andsubstantially plane plates slightly exceeding in length the Width olEthe sight openings, held by friction of their edges against the Walls ofthe tout, of color contrasting With that of the ink to he Contained inthe pen and opposite and substantially normal to the axes ot the sightopenings.

lElLlX RlESENBERG. llfitnesses:

CLINTON ll. BLAKE, Jr., lll. G. CRAWFORD.

